Leather-staking machine



No. 6|7,368. Patented Ian. l0, I899.

c. F. STAGKPOLEQ LEATHER STAKING MACHINE.

(Application filed Sept. 20, 1897.) v (No Model.) 2 Sheets-Sheat l.

witnesses:

M, M m. i if 4%? MQQM Patented Jan. 10, I899.

.L L 0 DI K c A T s C 8 6 U 6 0 N LEATHER STAKING MACHINE.

(Application meg Sept. 20, 1897.)

2 Sheets-Sheet 2.

(No Model.)

NlTED STATES PATENT, OFFICE.

CHARLES F. STACKPOLE, OF LYNN, MASSACHUSETTS.

LEATHER-STAKING MACHINE.

SPECIFICATION forming part of Letters PatentNO. 617,368, dated January10, 1899.

Application filed September 20, 1897. Serial No. 652,215. (No model.)

To all whom it may concern:

Be it known that I, CHARLES F. STAOKPOLE, of Lynn, in the county ofEssex and State of Massachusetts, have invented an Improved LeatherJVorking Machine, of which the following is a specification, referencebeing had to the accompanying drawings, in which Figure 1 is a plan, andFig. 2 an elevation, of my improved machine. Fig. 3 is an elevation withone of the side frames removed. Fig. 4 is a front elevation with a partbroken away. Figs. 5, 6, and 7 are details of the upper or supportingjaw.

My invention is an improvement in staking-machines, and I have shown itas applied to the staking-machine described in my Patout No. 501,593,dated July 18, 1893, and it relates, first, to the upper or supportingjaw, and, secondly, to the manner of opening and closing the jaws.

The first feature of my invention consists in making the upper orsupporting jaw e in the form of a cylinder (instead of a curved sheet,as in my aforesaid patent) and its elastic hearing or support 9 in theform of a roll, (instead of a rubber pad, as in my aforesaid patent.) Bymaking the sheet of vulcanized fiber or equivalent sheet material (fullydescribed in my aforesaid patent) in the form of a cylinder or jacket 6and its pad 6 in the form of a roll a new surface of the vulcanizedfibersheet can be presented by adjusting the roll, and thereby the strains bedistributed over the whole sheet instead of being confined tosubstantially one line across the sheet, as in my said aforesaid patent.Moreover, in many cases it is better that the upper jaw should revolve;but obviously this feature of my invention will be embodied in astakingmachine whose upper or supporting jaw is composed of a jacket ofvulcanized fiber or equivalent material supported on an elastic pad inthe form of a roll, whether the roll be fast in its bearings andreadjusted by being partially revolved from time to time in order tobring a new surface of the jacket into operation or whether the rollrevolve when in use in its bearings, so that the operating-surface ofthe jaw e changes constantly, for the result is the same in either case,although it is somewhat better to mount the roll so. that it and thejacket e will revolve when in use instead of mounting it so that it canbe revolved or shifted for readjustment only. I have not therefore shownin the drawings any means for preventing the roll e from revolving.

The term vulcanized fiber is now well known and largely used in themarket to describe a kind of stout paper with a smooth surface, which isflexible, practically nonextensible, and not readily torn; but othersheet materials having these qualities will answer, and for wet or dampwork a jacket of duck with a smooth surface of vulcanized rubber ispreferable.

As skins differ widely as to the pressure required between the jaws eand J, I make the roll e pneumatic-that is, hollow and fluidtight-s0that its softness and resiliency can be varied by varying the internalpressure of the fluid, and making the pad or support for the jaw e notonly in the form of a roll, but also in the form of a pneumatic roll,with provision for varying the internal pressure, is also a feature ofmy invention.

In the drawings I have shown the supporting pad 6 as a cylinder ofrubber partly closed at its ends and clamped between collars 8 and 9 bythe nut 10 on a hollow shaft 5, whose projecting ends form journalswhich enter boxes secured to bracket II. One end of the hollow shaft 5is plugged at 6, while the other end receives the nozzle of theinfiating-pump. Valve 11 closes when the inflating operation iscompleted, and pin 13 serves to keep valve 11 near its seat. The hollowshaft is of course perforated, as at 12, so that the inflating fluid mayenter the rubber cylinder 6 By this construction the jaw 6, whileafiording all the advantages due to the fact that it is composed oftough smooth sheet material, stiff, but pliable, and presenting asurface always substantially parallel with the scraping-jaw J, has theimportant additional advantage that it is supported on a pad whoseyielding and resilient qualities can be readily altered to suit theskins to be staked by simply varying the internal pressure. It ispreferable to make the pad e thicker at its middle, as shown at lin Fig.5, and for heavy work it may even touch the shaft near its middle, asthe jacket-jaw c is thereby less likely to be injured by being too muchbowed or forced much more toward shaft 5 at its middle than at its ends.

The frame of my machine, as shown in the drawings, is composed of twoside frames A and B, connected by the cross-rods a b, the apron C, andsupport R for the usual bolster. The carrier II for the jacket-j aw c isbolted to arm G, and arm G is fast to shoe f, which is ad justablysecured to lever F. Lever F is fulcrumed between the sides of bracket E,which is bolted to the upper end of its carrier D. The three-armed leverP is also fnlcrumed to bracket E, and one arm of leverP engages one endof lever F. The carrier H for the scraping-jaw J is fast to a second armof lever P, while the third arm carries the 1011 P, as explained below.

Bracket E and the parts carried by it are reciprocated by pitman M andcrank-pin O on driving-wheel K, as will be plain. The cam N is fast toshaft on, which is fast to pitman M and is actuated by the motion ofpitman M and opens the jaws, as shown in Fi 2, and closes them, as shownin Fig. 3, through its action on cam-roll P and lever P, for that arm oflever P which carries jaw J is moved toward the jacket-j aw 6 when thecam-roll P is moved by cam N, and at the same time that arm of lever Pwhich acts on lever F moves lever F against the force of spring g, andthereby moves jaw e toward jaw J. On the other hand, when cam N allowsroll P to approach the axis m spring 9 moves lever F to carry jaw e awayfrom jaw J and at the same time moves lever P to carry jaw J away fromjaw e. The spring 9 acts against lever F and through lever F and lever Pholds the cam-roll P in close contact with cam N, so that cam N actsthrough cam-roll P to throw lever .P in one direction and through leverP to throw lever F against the stress of spring and spring 9 acts tothrow lever F in one direction and through lever P acts to hold cam-rollP in contact with cam N.

Mounting the staking-jaws on a rocking support rocked by a pitman, whichsupport carries mechanism for actuating the jaws and the system oflevers carrying staking-jaws, in combination with a cam acting on one ofthe levers and a spring acting on the other, so that the motion of oneof the levers imparted to it by the cam will close the jaws and themotion of the other lever imparted to it by the spring will open thejaws, constitute the third and fourth features of my invention.

\Vhat I claim as my invention is- 1. In a staking-machine, a jacket-j awcomposed of a cylinder of stiff elastic sheet ma- 6o terial and anelastic roll as a backing, in combination with a scraping-jaw and meansfor operating said jaws, substantially as described.

2. In a staking-machine a jacket-jaw composed of a cylinder of stiffelastic sheet material and a pneumatic roll as a backing, in combinationwith a scraping-jaw and means for operating said jaws, substantially asdescribed.

In a staking-machine, levers carrying staking-jaws; mechanism foractuating the jaw-carrying levers and a rocking support which serves asa carriage for the j aw-carrying levers and the actuating mechanism allcombined substantially as described.

4:. In a staking-machine the combination of a cam; a lever actuated bythe cam in one direction; a second lever actuated by the first; and aspring actuating the second, and through the second actuating the firstin a direction opposed to that given to the first by the cam, allsubstantially as described.

CHARLES F. STACKPOLE.

lVitnesses:

WM. ll/IAYNADIER, JOHN R. SNOW.

